Update - with a number of new features, including the Query Store, it is now better to use SQL Server Management Studio Preview for import. In some cases, this will be necessary given the updated features in the bacpac file. You can install it from the download page. On this download page, select “Download SQL Server Management Studio Preview” to install.
Original answer The best solution is to install SQL Server Management Studio 2014 on the Express Download page. On this download page, select "MgmtStudio 32BIT \ SQLManagementStudio_x86_ENU.exe" when you click the download link. SSMS 2014 contains a newer version of DacFx, supporting version 2.5, and full support for SQL Server 2005-2014 dbs along with Azure DB.
A few notes in DacFx / SqlPackage:
Installing the latest SSDT will not fix the problem because SSDT no longer installs the Dac DLL in a shared location. Instead, it installs them in the Visual Studio installation directory (C: \ Program Files (x86) \ Microsoft Visual Studio 12.0 \ Common7 \ IDE \ Extensions \ Microsoft \ SQLDB \ DAC \ 120).
To upgrade the DacFx binaries used in SSMS to the latest version, you must install DacFramework.msi directly. You can download the latest version for 2014 here (this will update the location used by SSMS 2014), or if you need to use SSMS 2012 the latest compatible version is found here .
SqlPackage.exe supports bacpacs. You need to use the Import / Export actions for bacpacs, not the Extract / Publish actions used for dacpacs.
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